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Abstract:

The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > E th = 5.5 × 10 19 eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at E > E th are heavy nuclei with charge Z, the proton component of the sources shouldłead to excesses in the same regions at energies E/Z. We here report thełack of anisotropies in these directions at energies above E th /Z (for illustrative values of Z = 6,13,26). If the anisotropies above E th are due to nuclei with charge Z, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at thełower energies. © 2011 IOP Publishing Ltd and SISSA.

Registro:

Documento: Artículo
Título:Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
Autor:Abreu, P. et al.
Este artículo contiene 493 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 493 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:cosmic ray experiments; ultra high energy cosmic rays
Año:2011
Volumen:2011
Número:6
DOI: http://dx.doi.org/10.1088/1475-7516/2011/06/022
Título revista:Journal of Cosmology and Astroparticle Physics
Título revista abreviado:J. Cosmol. Astroparticle Phys.
ISSN:14757516
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2011_n6_p_Abreu

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Citas:

---------- APA ----------
(2011) . Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2011(6).
http://dx.doi.org/10.1088/1475-7516/2011/06/022
---------- CHICAGO ----------
Abreu, P. "Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory" . Journal of Cosmology and Astroparticle Physics 2011, no. 6 (2011).
http://dx.doi.org/10.1088/1475-7516/2011/06/022
---------- MLA ----------
Abreu, P. "Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory" . Journal of Cosmology and Astroparticle Physics, vol. 2011, no. 6, 2011.
http://dx.doi.org/10.1088/1475-7516/2011/06/022
---------- VANCOUVER ----------
Abreu, P. Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. J. Cosmol. Astroparticle Phys. 2011;2011(6).
http://dx.doi.org/10.1088/1475-7516/2011/06/022